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Design and implementation of single‐phase inverter without transformer for PV applications.

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Title: Design and implementation of single‐phase inverter without transformer for PV applications.
Authors: L, Ashok Kumar1 (AUTHOR), V, Indragandhi2 (AUTHOR) indragandhi.v@vit.ac.in, N, Sujith Kumar3 (AUTHOR)
Source: IET Renewable Power Generation (Wiley-Blackwell). Apr2018, Vol. 12 Issue 5, p547-554. 8p.
Abstract: For safety purposes, many photovoltaic (PV) systems are designed using galvanic isolation and transformers. The main problem in the existing topologies is that transformers are expensive, heavy and large. Another problem is that at conversion stage, the overall frequency is reduced. The efficiency of a PV inverter which is equipped with a transformer is usually between 91 and 94%. To tackle this issue, a transformerless (TL) PV system is proposed which has high efficiency and is lighter and cheaper. Due to stray capacitance, harmful leakage current will flow to the grid and PV array. H5, HERIC, H6 and oH5 are different types of existing TL inverter, and may be used to solve this problem. Each configuration has its drawbacks like shoot‐through issues of switches, high conduction losses, metal‐oxide‐semiconductor field‐effect transistor reverse recovery issues, or to avoid shoot‐through fault when dead time requirements and grid voltage are nearly zero. The efficiency of the proposed TL inverter presented in this study is compared with other existing configurations. It shows that the proposed inverter efficiency is better than the conventional hard switching inverters. Moreover, to increase reliability, the inverters do not contain any shoot‐through issues. [ABSTRACT FROM AUTHOR]
Copyright of IET Renewable Power Generation (Wiley-Blackwell) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 148146815
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  Data: Design and implementation of single‐phase inverter without transformer for PV applications.
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  Data: <searchLink fieldCode="AR" term="%22L%2C+Ashok+Kumar%22">L, Ashok Kumar</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22V%2C+Indragandhi%22">V, Indragandhi</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> indragandhi.v@vit.ac.in</i><br /><searchLink fieldCode="AR" term="%22N%2C+Sujith+Kumar%22">N, Sujith Kumar</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22IET+Renewable+Power+Generation+%28Wiley-Blackwell%29%22">IET Renewable Power Generation (Wiley-Blackwell)</searchLink>. Apr2018, Vol. 12 Issue 5, p547-554. 8p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: For safety purposes, many photovoltaic (PV) systems are designed using galvanic isolation and transformers. The main problem in the existing topologies is that transformers are expensive, heavy and large. Another problem is that at conversion stage, the overall frequency is reduced. The efficiency of a PV inverter which is equipped with a transformer is usually between 91 and 94%. To tackle this issue, a transformerless (TL) PV system is proposed which has high efficiency and is lighter and cheaper. Due to stray capacitance, harmful leakage current will flow to the grid and PV array. H5, HERIC, H6 and oH5 are different types of existing TL inverter, and may be used to solve this problem. Each configuration has its drawbacks like shoot‐through issues of switches, high conduction losses, metal‐oxide‐semiconductor field‐effect transistor reverse recovery issues, or to avoid shoot‐through fault when dead time requirements and grid voltage are nearly zero. The efficiency of the proposed TL inverter presented in this study is compared with other existing configurations. It shows that the proposed inverter efficiency is better than the conventional hard switching inverters. Moreover, to increase reliability, the inverters do not contain any shoot‐through issues. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of IET Renewable Power Generation (Wiley-Blackwell) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1049/iet-rpg.2017.0257
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 547
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      – TitleFull: Design and implementation of single‐phase inverter without transformer for PV applications.
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          Name:
            NameFull: L, Ashok Kumar
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            NameFull: V, Indragandhi
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            NameFull: N, Sujith Kumar
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            – D: 01
              M: 04
              Text: Apr2018
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              Y: 2018
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              Value: 12
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            – TitleFull: IET Renewable Power Generation (Wiley-Blackwell)
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